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The Kuzu-ryūsen, however, is a byproduct used for the initiation in learning Amakakeru Ryū no Hirameki (天翔龍閃?, lit. "Heavens Gliding Dragon Flash"; Viz translation - "Dragon Flight of Heaven"), a Hiten Mitsurugi-ryū battōjutsu that surpasses the speed of the Kuzu-ryūsen.[26] The secret behind the technique lies in an additional step with the left foot, which adds instantaneous acceleration and weight to the sword.[27] In addition, if the initial strike is avoided or blocked, the force of the unusually fast slashing motion displaces the air around it, generating a vacuum in its wake and sucking the opponent in; as this happens, the body is spun around for a second strike, with the previous action adding force and momentum to the swing, making the subsequent strike far stronger.[28] Since the Hiten Mitsurugi-ryū is only suitable to a wide-framed muscular build like that of Seijūrō's, Kenshin's body deteriorates and he is unable to use it ever again by the end of the manga.[20]